Bug Description

When you type username starting with upper letter during Ubuntu 10.04 installation, it is marked as it is correct with green tick. Then if you click "Forward" button, such username is refused with message that it should not start with upper letter. Well, you should either allow it (as OpenSUSE does) or not mark it as OK when it is typed.

My Bug #658651 was marked as duplicate of this. However, in Ubuntu 10.10 this bug is a lot worse than what was discribed here for 10.04, since there is no warning what so ever of what causes the inability to finish the setup. You get a green tick beside the username but the next button is disabled.